Okay, so I've been having a trouble with a lot lately, when I'm for instance, adding a new band to metal-archives, the band picture can't be bigger than 100K, which ends up with a really small, blurry and shitty image but at the same time, some bands has images that are way bigger than 100k, here's some of those bands:

PLEASE use "Save for Web..." instead. Aside from offering you granular control over image quality (allowing you to balance it against filesize), it doesn't embed a hideous 25 KBs chunk of Photoshop-only data that's lodged inside the file if you use the "Save as..." function.